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Figure 21. Schematic of transient electronics in the field and photographs of a transient TENG device under winter sunlight as a proof of concept. 2.4.1 Transient Polymer PPHA Low ceiling temperature, cyclic PPHA was cationically polymerized in dichloromethane (DCM) at -80 °C using boron trifluoride etherate (BF3OEt2) as the catalyst. The reaction scheme is shown in Figure 22a. The continuous insertion mechanism of monomer, ortho-phthalaldehyde (oPA), into the cyclic structured PPHA, as described in Schwartz et al.,125 ensured the formation of high molecular PPHA until the reaction equilibrium was achieved. The acetal linkage on the PPHA backbone is highly susceptible to strong acid attack to result in ring-opening of cyclic structure.126 Upon ring-opening of cyclic PPHA, the end-group unprotected PPHA would rapidly depolymerize back to oPA due to its low ceiling temperature nature. In this study, a superacid (i.e., pKa less than that of 100% pure sulfuric acid) was in-situ produced upon exposure to UV/visible light using photo-induced electron transfer (PiET) reaction mechanism between anthracene and Rhodorsil FABA.127 Figure 22b explains the reaction mechanism of PiET reaction. 61PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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